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📐 '''Layer''' is a defined band of [[Definition:Coverage | coverage]] within an [[Definition:Insurance | insurance]] or [[Definition:Reinsurance | reinsurance]] program, bounded by a lower [[Definition:Attachment point | attachment point]] and an upper limit, that specifies the portion of a [[Definition:Loss | loss]] a particular party is responsible for. Layering is the structural backbone of virtually every complex commercial and reinsurance placement — it allows risk to be sliced horizontally so that different [[Definition:Insurance carrier | carriers]], [[Definition:Reinsurer | reinsurers]], or the insured itself can each absorb a portion of potential losses that corresponds to their appetite, pricing, and [[Definition:Capital | capital]] position. A typical program might include a [[Definition:Self-insured retention (SIR) | self-insured retention]] at the bottom, a [[Definition:Primary insurance | primary layer]], one or more [[Definition:Excess insurance | excess layers]], and potentially an [[Definition:Umbrella insurance | umbrella]] or [[Definition:Catastrophe bond | catastrophe bond]] at the top.

🔗 Each layer in a program is defined by two key parameters: the attachment point (the dollar amount at which coverage in that layer begins) and the [[Definition:Policy limit | limit]] of liability (the maximum the layer will pay). For example, a $10 million excess of $5 million layer attaches once a loss surpasses $5 million and will respond for up to $10 million of additional loss — meaning it exhausts at $15 million. Different layers often carry different [[Definition:Premium rate | rates]], [[Definition:Policy terms and conditions | terms]], and even different insurers. In the [[Definition:London market | London market]], a single layer may be subscribed by multiple [[Definition:Lloyd's syndicate | Lloyd's syndicates]] and company markets, each taking a percentage [[Definition:Line (subscription) | line]]. [[Definition:Reinsurance broker | Reinsurance brokers]] and [[Definition:Insurance broker | wholesale brokers]] structure these towers to optimize cost and capacity, placing riskier lower layers with markets that specialize in [[Definition:Working layer | working-layer]] pricing and pushing higher, less-likely-to-be-reached layers to capacity providers willing to write at lower [[Definition:Rate on line (ROL) | rates on line]].

🧩 The layered approach is powerful because it matches economic incentives to risk position. The policyholder retains losses it can absorb, the primary insurer prices for frequent and moderate claims, and excess and reinsurance markets price for severity events they are better capitalized to handle. When structured well, a layered program reduces the cost of total risk transfer compared to a single monoline placement, because each participant prices only the slice of risk it understands and is willing to bear. For [[Definition:Underwriting | underwriters]], analyzing where within a loss distribution a given layer sits — and how [[Definition:Loss development factor | loss development]], [[Definition:Trend factor | trend]], and [[Definition:Clash loss | clash exposure]] affect that layer — is among the most technically demanding aspects of the profession. As [[Definition:Alternative risk transfer (ART) | alternative risk transfer]] instruments like [[Definition:Insurance-linked securities (ILS) | insurance-linked securities]] have matured, the concept of layering has extended into [[Definition:Capital markets | capital markets]], where investors can select specific risk layers that match their return and volatility preferences.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Attachment point]]
* [[Definition:Excess insurance]]
* [[Definition:Reinsurance]]
* [[Definition:Self-insured retention (SIR)]]
* [[Definition:Rate on line (ROL)]]
* [[Definition:Policy limit]]
{{Div col end}}

Definition:Layer - Revision history

PlumBot: Bot: Creating new article from JSON